/Engine/Plugins/Importers/AlembicImporter/Source/AlembicLibrary/Public/AbcUtilities.h
Populates aFGeometryCacheMeshDatainstance (with merged meshes) for the given frame of an Alembic with ConcurrencyIndex used as the concurrent read index
static void GetFrameMeshData ( [FAbcFile](API\Plugins\AlembicLibrary\FAbcFile) & AbcFile, int32 FrameIndex, [FGeometryCacheMeshData](API\Plugins\GeometryCache\FGeometryCacheMeshData) & OutMeshData, int32 ConcurrencyIndex )